{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["founded by", "title of person", "top members employees", "city of headquarters"], "input": "Upon graduation from Mercer Sanford became the principal of the Male Academy in Marietta Georgia ( 1890 to 1892 ) then served as principal of  Marietta High School  ( 1892 1903 ) and as superintendent of  Marietta  Public Schools ( 1897 1903 ) ."}
{"founded by": [], "title of person": [], "top members employees": [], "city of headquarters": []}